package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.OrdersCancelDTO;
import com.sky.dto.OrdersPageQueryDTO;
import com.sky.dto.OrdersSubmitDTO;
import com.sky.entity.AddressBook;
import com.sky.entity.OrderDetail;
import com.sky.entity.Orders;
import com.sky.entity.ShoppingCart;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.AddressBookMapper;
import com.sky.mapper.OrderDetailMapper;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private WebSocketServer webSocketServer;
    /**
     * 用户下单
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {

        //1.处理各种业务异常（地址薄为空，购物车数据为空）
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if(addressBook == null){
            //抛出业务异常
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        //查询当前用户的购物车数据
        Long userId = BaseContext.getCurrentId();

        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list == null || list.size() == 0){
            //抛出业务异常
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //2.向订单表中插入一条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO,orders);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setUserId(userId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setPayStatus(Orders.UN_PAID);

        orderMapper.insert(orders);

        List<OrderDetail> orderDetailList = new ArrayList<>();
        //3.向订单明细表中插入n条数据
        for (ShoppingCart cart:list){
            OrderDetail orderDetail = new OrderDetail();//订单明细
            BeanUtils.copyProperties(cart,orderDetail);
            orderDetail.setOrderId(orders.getId());
            orderDetailList.add(orderDetail);
        }

        orderMapper.insertBach(orderDetailList);

        //4.清空当前用户的购物车数据
        shoppingCartMapper.deleteByUserId(userId);

        //5.封装VO返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .id(orders.getId())
                .orderAmount(orders.getAmount())
                .build();

        //通过websocket向客户端浏览器推送消息type orderId content
        Map map = new HashMap<>();
        map.put("type",1);
        map.put("orderId",orders.getId());
        map.put("content","订单号" + orders.getNumber());

        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);

        return orderSubmitVO;
    }

    /**
     * 用户订单分页查询
     * @param pageNUm
     * @param pageSize
     * @param status
     * @return
     */
    public PageResult pageQuery4User(int pageNUm, int pageSize, Integer status) {
        //1.设置分页
        PageHelper.startPage(pageNUm,pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        //分页条件查询
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList<>();

        //查询出订单明细，并封装入redisVO进行响应
        if(page != null && page.getTotal() > 0){
            for(Orders orders:page){
                Long orderId = orders.getId();

                //查询订单明细
                List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(orderId);

                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders,orderVO);
                orderVO.setOrderDetailList(orderDetails);

                list.add(orderVO);
            }
        }
        return new PageResult(page.getTotal(),list);
    }

    /**
     * 查询订单详情
     * @param id
     * @return
     */
    public OrderVO details(Long id) {
        //根据id查询订单
        Orders orders = orderMapper.getById(id);

        //查询该订单对应的菜品/套餐明细
        List<OrderDetail> detailList = orderDetailMapper.getByOrderId(orders.getId());

        //将该订单及其详情封装到OrderVO并返回
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders,orderVO);
        orderVO.setOrderDetailList(detailList);

        return orderVO;
    }

    /**
     * 用户取消订单操作
     * @param id
     */
    public void userCancelById(Long id) {
        //1.根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        //2.校验订单是否存在
        if(ordersDB == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        //订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        if(ordersDB.getStatus() > 2){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(id);

//        //订单处于待接单的状态下取消，需要进行退款
//        if(ordersDB.getStatus() == 2){
//            WeChatPayUtil.refund(
//                    ordersDB.getNumber(),
//                    ordersDB.getNumber(),
//                    new BigDecimal(0.01),
//                    new BigDecimal(0.01));
//
//            //支付状态修改为退款
//            orders.setPayStatus(Orders.REFUND);
//        }

        //更新订单状态 取消原因 取消时间
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason("用户取消");
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);

    }

    /**
     * 用户再来一单
     * @param id
     */
    public void userreptitionById(Long id) {
        //1.根据订单id查询订单明细
        List<OrderDetail> OrderD = orderDetailMapper.getByOrderId(id);

        //查询当前用户id
        Long userId = BaseContext.getCurrentId();


//自己独立开发
//        //2.将订单明细表中的菜品数据添加到购物车中
//        for(OrderDetail orderDetail : OrderD){
//            ShoppingCart shoppingCart = new ShoppingCart();
//            BeanUtils.copyProperties(orderDetail,shoppingCart);
//            shoppingCart.setCreateTime(LocalDateTime.now());
//            shoppingCart.setUserId(userId);
//            shoppingCartMapper.insert(shoppingCart);
//        }

        // 将原订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = OrderD.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            //  将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x,shoppingCart,"id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        //将购物车对象批量插入数据库
        shoppingCartMapper.insertBatch(shoppingCartList);
    }


    /**
     * 客户催单
     */
    public void reminderById(Long id) {
        //根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        //校验订单是否存在
        if(ordersDB == null){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Map map = new HashMap<>();
        map.put("type",2);  //1表示来单提醒   2表示用户催单
        map.put("orderId",id);
        map.put("content","订单号：" + ordersDB.getNumber());

        String jsonString = JSON.toJSONString(map);

        webSocketServer.sendToAllClient(jsonString);
    }


    /**
     * 管理端订单分页查询
     */
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        //1.设置分页
        PageHelper.startPage(ordersPageQueryDTO.getPage(),ordersPageQueryDTO.getPageSize());

        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        //部分订单状态，需要返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);

        return new PageResult(page.getTotal(), orderVOList);
    }



    private List<OrderVO> getOrderVOList(Page<Orders> page){
        //需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getResult();
        if(!CollectionUtils.isEmpty(ordersList)){
            for(Orders orders:ordersList){
                //将共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders,orderVO);
                String orderDishes = getOrderDishesStr(orders);

                //将订单菜品信息封装到OrderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    private String getOrderDishesStr(Orders orders){
        //查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        //将每一条订单菜品信息拼接为字符串（）格式：宫保鸡丁*3;
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        //将该订单对应的所有菜品信息拼接在一起
        return String.join("",orderDishList);
    }

    /**
     * 查询各个状态的订单
     * @return
     */
    public OrderStatisticsVO statistics() {
        //根据状态：分别查询出  待接单，待派送，派送中的订单数量
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);

        //将查询出的数据封装到orderStatisticsVO中响应
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);
        return orderStatisticsVO;
    }

    /**
     * 商家取消订单
     * @param ordersCancelDTO
     */
    public void cancel(OrdersCancelDTO ordersCancelDTO) {
        //根据id查询订单
        Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());

//        //支付状态
//        Integer payStatus = ordersDB.getPayStatus();
//        if (payStatus == 1) {
//            //用户已支付，需要退款
//            String refund = weChatPayUtil.refund(
//                    ordersDB.getNumber(),
//                    ordersDB.getNumber(),
//                    new BigDecimal(0.01),
//                    new BigDecimal(0.01));
//            log.info("申请退款：{}", refund);
//        }

        //管理端取消订单需要退款，根据订单id更新订单状态，取消 原因，取消时间
        Orders orders = new Orders();
        orders.setId(ordersCancelDTO.getId());
        orders.setCancelTime(LocalDateTime.now());
        orders.setCancelReason(ordersCancelDTO.getCancelReason());
        orders.setStatus(Orders.CANCELLED);
        orderMapper.update(orders);
    }

    /**
     * 派送订单
     * @param id
     */
    public void delivery(Long id) {
        //根据id查询订单
        Orders orderDB = orderMapper.getById(id);

        //判断订单是否存在，并且status是否为3（已接单）
        if(orderDB == null || !orderDB.getStatus().equals(Orders.CONFIRMED)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(id);
        //更新订单状态为派送中
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);

        orderMapper.update(orders);

    }

    /**
     * 完成订单
     * @param id
     */
    public void completeById(Long id) {
        //根据id查询订单
        Orders orderDB = orderMapper.getById(id);

        //判断订单是否存在，并且status == 4
        if (orderDB == null || orderDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }


        Orders orders = new Orders();
        orders.setId(id);
        //更新订单状态,状态转为完成
        orders.setStatus(Orders.COMPLETED);
        orders.setDeliveryTime(LocalDateTime.now());

        orderMapper.update(orders);
    }


}
